I had health insurance last year through a Marketplace plan but paid the full premium myself because I made too much to qualify for premium tax credit. When I did my taxes, my income for the year ended up being less than I expected and I may have been eligible to receive the premium tax credits. Can I still get it?

Yes. Premium tax credits can be claimed in advance (during the year) or when you file your taxes. To claim the credit, you will need to file a federal income tax return and Form 8962. Follow the instructions on Form 8962 to determine the amount of tax credit you should receive as a tax refund when you file your taxes.